Records containing firefighters' personal information — including Social Security numbers, names, addresses and phone numbers — were found in the condemned firehouse in downtown Yonkers.

The personnel records were misfiled under the previous administration, according to Fire Commissioner Robert Sweeney, and left in the New School Street firehouse before the Yonkers Fire Department moved its headquarters to Nepperhan Avenue in 2011.

Two fire companies remained in the building until it was condemned in 2015. The old firehouse has since been closed off by chain-linked fencing.

"The city is taking all precautions to ensure the personnel documents are removed and the building is secured," Christina Gilmartin, spokesperson for Mayor Mike Spano, said.

After learning of the discovery, the fire union — Local 628 — filed a grievance against the city.

In a letter to the city's attorney, the fire union's lawyer Richard Corenthal said, "On the face of it, it appears that the city has been grossly negligent in failing to protect the privacy of its employees in violation of state and federal laws as well as the common law."

The documents were found last week after demolition crews threw everything that was left in the building to the first floor in preparation for demolition, Sweeney said.

Firefighters noticed the documents, which included medical records among other paperwork, when they did a last-minute walk through, Sweeney said.

An artist rendering for the new Fire Station #1 in downtown Yonkers.(Photo: submitted)

The demolition is part of a $10 million project, which was approved in December and is underway, to level the condemned firehouse and build a new one near the corner of Palisade Avenue and New School Street.